The MACD histogram measures the distance between the MACD line and its signal line. Its real value is showing the rate of change of momentum. Growing bars mean the move is accelerating; shrinking bars mean it is losing steam even if price still rises.
Rising versus fading bars
When bars are expanding away from zero, the two MACD lines are separating and momentum is strong — often a healthy sign for a continuing trend. When bars start contracting toward zero, the lines are converging and momentum is fading, hinting a pullback or crossover may be near.
You can also spot histogram divergence: price makes a new high but the peak histogram bars are smaller than before, showing the push had less force. As with RSI divergence, this is an early warning about momentum, not a reversal signal in itself.
- Bars growing = momentum accelerating with the trend.
- Bars shrinking = momentum fading; a cross or pullback may follow.
- Shorter bars at a new price high hint at weakening drive.
- Momentum reading, not a standalone buy or sell trigger.
The histogram reads momentum's rate of change — growing bars back a trend, shrinking bars warn it is running out of fuel.